Refrigeration



June 4, 1940. w, K ENZL, 2,203,023

REFRIGERATION Filed NOV. 17, 1938 Wm INVENTOR I ATTORNEY.

Patented June 4, 1940 REFRIGERATION Walter A. Kuenzli, Evansville, Ind., asslgnor to Servel, Inc., New York, N. Y., a corporation of Delaware Application November 17, 1938, Serial No. 240,893

3 Claims.

My invention relates to refrigeration and more particularly to a heat transfer system by which cooling may be effected at a place above a source of refrigeration.

It is an object of the invention to provide greater stability in a system of this character operated by staged vapor lift action. The invention constitutes an improvement in a system like that described in an application Serial No. 218,485 of Bennet Carroll Shipman, filed July 9, 1938.

The drawing shows more or less schematically a heat transfer system embodying the invention.

A cooling element l8 represents a source of refrigeration. It is shown as an evaporator of a uniform pressure absorption type refrigeration system like that described in an application Serial No. 107,852 of Albert R. Thomas, filed Oct. 2'7, 1936. In the evaporator I0 is a pipe coil ll. Liquid refrigerant enters the upper part of evaporator Ill through a conduit l2. Inert gas enters the upper part of evaporator l0 through a conduit l3 and a cylinder M which is within the pipe coil ll. Gas leaves the evaporator l0 through conduit l5. Liquid refrigerant from conduit l2 flows into a distributor l6. Liquid is deposited from distributor l8 onto the top of coil II. The liquid refrigerant flows downward over coil II and evaporates and diffuses into the gas,

producing a refrigeration effect for cooling the so coil II.

The upper end of coil I l is connected by a conduit I! to the upper part of a gas and liquid separation vessel |8. The upper end of coil II is also connected by conduit l1 and a conduit l9 to theupper part of a second gas and liquid separation vessel 20; The lower end of coil II is connected by a conduit 2| to the lower part of a gas lift vessel 22. The upper part of vessel 22 is connected by a conduit 23 to separation vessel 20. The bottom of separation vessel 20 is connected by a conduit 24 to the lower part of a second gas lift vessel 25. The top of vessel 25 is connected by a conduit 28 to separation vessel l8. In a refrigerator storage compartment 21 are two flnned evaporator coils 28 and 29 arranged for cooling air in this compartment. The lower ends of evaporator coils 28 and 29 are connected by a conduit 38 to the lower part of separation vessel l8. The upper end of evaporator coil 28 is connected by a conduit 3| to a nozzle 32 in the gas or vapor lift vessel 25. The upper end of evaporator coil 29 is connected by a conduit 33 to a nozzle 34 in the gas or vapor lift vessel 22.

Coil II and evaporator coils 28 and 29 together with the above described connections therebetween form a heat transfer system which is evacuated and charged with a suitable heat transfer fluid, such as methyl chloride. When the refrigeration apparatus is started, the evaporator I0 lowers the temperature of condenser coil'l I, causing a reduction in pressure in this coil and also in conduit l1, conduit l9, and separation vessels It and 20. Vapor in the upper evaporator coils 28 and 29 and in conduits 3| and 33 tries to escape to the part of the system in which the pres- 10 sure has been lowered. In doing so, the vapor flows into liquid in the lift vessels 22 and 25 through the nozzles 32 and 34. From the nozzle 34 the gas bubbles upward into conduit 23 causing liquid to rise through this conduit from vesu sel 22 into separation vessel 20. Vapor bubbles from nozzle 32 upward into conduit 26 and causes liquid to rise through this conduit into separation vessel l8.

Refrigeration liquid flows from separation vessel l8 through conduit 30 into the evaporators 28 and 29. Liquid evaporates in evaporators 28 and 29 for cooling the refrigerator compartment 21. From the separation vessels I8 and 20, vapor flows through conduits l1 and I9 into the con- 25 denser coil ll. Vapor is condensed to liquid in coil II and flows therefrom through conduit 2| into lift chamber 22. Liquid is raised from lift chamber 22 through conduit 23 into vessel 20 as previously described. Liquid flows from vessel 30 20 through conduit, .24 into lift chamber 25. Liquid is raised from chamber 25 through conduit 26 into separation vessel was previously described.

Liquid is thus raised in two stages. Vapor for 5 the first stage lift is supplied from evaporator 29 through conduit 33. Vapor for the second stage is supplied from evaporator 28 through conduit 3|. There is thus provided a separate supply of vapor for each lifting stage.

What is claimed is:

l. A heat transfer system including a closed circuit for volatile fluid having a plurality of places of evaporation, a place of condensation at a level below said places of evaporation, and 45 means for raising liquid from said place of condensation upward to said places of evaporation, said means utilizing vapor from one of said places of evaporation for raising liquid part of the way and vapor from another of said places 50 I of evaporation for raising liquid another part of the way. a

2. A heat transfer system comprising a circuit' for volatile heat transfer fluid including a plurality of evaporators at .an upper level and a' condenser at a lower level, a plurality of vapor liquid lifts arranged in series to raise liquid from said lower level to said upper level, one of said lifts being connected to receive vapor from one of said evaporators, and another of said lifts being connected to receive vapor from another of said evaporators.

3. A method of heat transfer which includes evaporating liquid refrigerant in a plurality of places, condensing vaporous refrigerant below said places of evaporation, raising condensed refrigerant by vapor lift action in a plurality of stages, utilizing vapor from one of said places of evaporation in one of said stages and vapor from another of said places of evaporation in another of said stages.

WALTER. A. KUENZLI. 

